Turntable



0t 15 1929. P. c. A. VAN DER MEER 1,732,113

TURNTABLE 2 Sheets-Sheet Filed June 5. 192B f P. c. A. VAN DER MEER1,732,113

Oct. 15, 1929.

TURNTABLE 2 sheets-sheet 2,

Filed June 5. 1928 Patented st. 15, 1929 barro STATES y PATENToi=i=iciafA PETER c. A. VAN DER ivinnnjorfnnrnorr, MICHIGAN TURNTABLEApplication filed .Tune 5, 1928:. Serial No. 283,069. i

The present invention relates to turntables. y An object of theinvention is to provide a turntable having an extremely small over-7 allheight, so that the object to be placed upon ,g it need not be liftedthrough any great disg Y 10 turntable which is flat as a whole andwhichY is constructed to take horizontal thrust in. any direction andwhich at the saine time does not tip, but is always level regardless ofthe location of the weight placed upon it.

lt is a further object of the invention to provide a turntable having arotatable ball center so constructed and arranged that nov balancing ofthe turntable is ever required, and to provide in a turntable aparticular form of ball raceways. Further objects are to provide aturntable having relatively small weight, with protecting` means forantifriction bearings, with a draining channel and with strength-A eningribs, webs and bosses so arranged as to. provide a turntable ofrelatively grea strength and small Weight. Still further objects andadvantages of the.

invention will appear from the following'.

description taken in connection with the accompanying drawings, whichillustrate, by'. way of example, a preferred embodiment of theinvention, but which are not to .be taken as a definition of the limitsthereof, reference being had to the appended claims for that purpose.

In the drawings:

Fig. 1 is a perspective view of a turntable constructed in accordancewith and enibody-y ing the present invention;

Fig. 2 is a top plan view thereof;

Fig. 3 is a vertical crossesectional view taken diametrically throughFig. 2; and

Fig. 4 is a perspective view showing the upper and lower parts of theturntable sep-V arated to illustrate the interior thereof and with thecircumferential series of antifriction bearings removed to illustratethe bearing, raceway.

Fig. 5 is an enlarged fragmentary sec-L tional view through a portion ofthe turntable near its edge.

Referring in.detail to the accompanying drawings, a circular shallowbase 11 is provided at `its outerperipheral edge with an V,fa/nnularstrengthening portion 12 of in# creasedthiclrness and its center with acentral boss 13, the upper face of vrwhich is cupped for the receptionof a single center bearing ball 14 freely rotatable.` The Vbase 11 isalsorprovided `with a plurality of yradially extending strengtheningwebs 15 veach provided Ywith an outer end portion 16 of increasedthickness vand strength, which f can be tapped for thereception of ananchor bolt. The base 11 is also provided with a cir` cumferentiallyextending antifriction bearf ing raceway 17, herein shown as beingsquareshapedin cross section, for the reception of a circular series ofball bearings 1S which are freelymovable and arranged closely adjacentand substantially in contact with each otherv so `that 'there is noappreciable space between any twol adjacent ball bearings. Radiallyoutward with respect to the raceway'17, the base 11 is provided with anannular depression 19 circular in cross section,

constituting a waste and drainage channel having oneor more downwardlydirected outlets 2O.4 The drainage channel 19 is sepiaratednfrom theraceway 17 by an upstanding annular flange 22. The ri1n724 of the base1.1 extends upwardly a. short distance above thegenerallevel of theinterior of the base and is flat at its upper surface, which is levelwith and forms in effect a continua- Y tion of the revolving top 25 ofthe turntable.

u The top 25 is provided interiorly at the center thereof with a seat 27for the reception ofthe upper portion of theicenter bearing ball I. 14,and extending radially from the center seat 27 are a plurality ofbracing and strengthening webs 29 which are cut away at their outerends, as at 30, to permit the webs 29 to pass freely over the raisedportions, 16 of the base webs 15.

The webs 29 extend outwardly to and terminate at a downwardly extendingannular guard flange 34, which fits within the circular series of ballbearings 18. The outer edge 36 of the top 25 is flat and of eventhickness and overlies the ball bearings 18 and drainage channel 19, andextends toward and is closelyadjacent to the flat top rim 24 of thebase', from which the top is spaced bythe very?l small distancenecessary for clearance and to prevent friction between the top and. thebase.

and a relatively flat top resting on all of said balls, the under sideof said top being substantially flat and extending over said drainagegroove and ball bearings.

In testimony whereof I aliix my signature.

PETER C. A. VAN DER MEER.

lt will be noted that the circular series of Y ball bearings 18 bearsagainst the under side of the top 25 and that no bearing flanges areprovided on said top. This construction enablcs the top to take thrustimposed upon it in any direction; the top 25 is level at all times andrests upon the center ball 14 and also on the circular series of balls18, So that tipping of the top never occurs and no balancing is everrequired; furthermore, the turntable as a whole is relatively flat orshallow and consequently requires only an extremely shallow pit wherethe top is to be used at floor level. The balls 18 bear at two pointsagainst the base, namely, at the bottom of the raceway 17 and againstthe inner wall thereof.

Various changes in minor details may be made within the scope of theinvention, as defined by the following claims.

What is claimed is:

1. A turntable including a base having radially extending bracing websraised near their outer ends, and having an annular y grooved racewaynear its periphery, a circular series of closely adjacent freely movableball bearings in said raoeway, said base having an annular drainagegroove of greater diameter than said raceway, a single center bearingball in said base, a rotatable disc top resting on said series of ballbearings and f1tting Within said base and having a depending annularguard flange clear of the inner periphery of said ball bearings, acenter bearing resting on said center ball, and a plurality of radialbracing Webs cut away near their outer ends and extending to saiddepending guard flange, said dise top being flat on its under sideradially outward of said guard flange and extending over said annulardrainage groove in close proximity to and level with the peripheral edgeof said base.

2. A turntable including a base having a circular raceway, a circularseries of closely adjacent freely movable ball bearings in said raceway,a peripheral drainage groove of greater diameter than said raceway, afreely movable center ball in said base, and a relatively flat topresting on all of said balls and having an annular guard flange withinsaid circular series of ball bearings, the peripheral edge of said topbeing flat and extending over said raceway and said drainage groove.

3. A turntable including a relatively Shallow base having a peripheraldrainage groove and a circular series of closely adjacent freely movableball bearings, a central bearing ball,

